split cat6 for 2 POE cisco phone

Posted on 2009-12-15
Last Modified: 2013-11-09
Hi Experts,
                 Dont ask me why i would do such a thing but i was just wondering if we could split a CAT 6 cable and have 2 POE with data ports. Can you also send a diagram of the wiring structure. Thanks.
Question by:mun_84
    LVL 6

    Expert Comment

    I don't think so. usually POE use power on pair 4,5 and 7,8. so you can't split them
    LVL 6

    Expert Comment

    see it show wire structure at the end of the page

    Author Comment

    dont understand as i can see that 4 is in use and 4 not in use. So does that mean is it YEs it can be done or not?
    LVL 2

    Assisted Solution

    The 802.3af specification allows the DC voltage to work across the same pairs as data or across the spare pairs. It will greatly depend on the abilities of your device. You could do what you want to do if your equipment supports that configuration. I don't recommend it but if you were to test this out you could do it this way on each end of the cable:

    Pin 1,2,3,6 - split to 1st cable with 1,2,3,6
    Pin 5,4,7,8 - split to 2nd cable as 1,2,3,6

    To test, try just using one connection to see if comes up. If not, then your equipment wouldn't support it. Honestly, I'm not sure how things will work running PoE twice over the same 4 pair cable.
    LVL 6

    Accepted Solution

    it is depend on the power source. 802.3af allow both way.  Cisco use power on spare.

    Author Closing Comment

    Makes Sense. Thanks Guys

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